Condenser control for radios



Patented Jan. 4, 1927.

UNITED STATES WILLIAM G. DUNN, OF OLARINDA, IOWA.

CONDENSER CONTROL FOR RADIOS.

Application filed March 3, 1926. Serial No. 92,013.

The object of my invention is to provide a simple, durable and comparatively inexpensive condenser control for radios.

More particularly it is my object to pro- 'vide a control device for the rotors of the condenser movable through an arc of des wherein quick and easy adjustment of the rotors relative to the stators may be obtained.

Still a further object is to provide a lever for each of the rotors adapted to have their ends which are engaged for controlling them, brought side by side and capable of being operated at one time for operating the rotors in unison and at the same time to permit the control ends of the levers to be moved and disengaged from the other levers wherein any one of the rotors may be operated independently of the others.

Still a further object is to provide a main control for the rotors and auxiliary controls, all operable from the main control when desired and the auxiliary control being capable of independent operation wherein fine adjustment of the rotors may be had.

Still a further object is to provide a casing for thecondenser and other radio equipment having one of its walls curved in an arc of substantially 90 degrees and through this wall extends the control ends of the levers which are movable through an arc of substantially 90 degrees.

Still a further object is to provide a slight- 1y modified form of control wherein the rotors are operated by a single control lever and a part of the stator elements are operated by independent levers for permitting slight adjustment of the stators relative to the rotors.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more .fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1, is a perspective view of a radio case having my improved condenser control unit therein.

Figure 2, .is a sectional view showing one end of the condenser control in the casing.

Figure 3, is a sectional view taken on line 3-3 of Figure 2.

Figure 4, is an enlarged detail perspective view of the control ends of the levers for operating the rotors.

Figure 5, is a perspective view of a condenser of a slightly modified form and Figure '6, is a perspective view of a portion of a casing applicable for the condenser controls shown in Figure 5.

In the accompanying drawings I have used the reference character A to indicate generally a casing which includes a base or bottom 10. aback wall 11 and a front or curved wall 12.

The curved wall 12 is formed in substantially a 90 degree are and may be used for placing any data thereon necessary and desirable in connection with radios as for example the particular station and the wave length or other information necessary to tune in for a particular station.

The condenser includes a plurality of stator elements 13 mounted upon the bottom 10.

For each stator element there is provided a rotor element 141. The rotor elements 14 are each mounted upon shafts 15.

Each shaft 15 has a control lever connected thereto and extending outwardly therefrom.

The levers are referred to as the main lever 16 and also auxiliary levers 17 and 18.

The levers 16. 17 and 18 all have their upper ends brought in close position and extended through a slot 19 formed in the curved wall 12 as clearly shown in Figure 1 of the drawings.

The main lever 16 has a block 20 of an suitable material mounted thereon whic travels within the slot 19.

A finger piece or handle 21 is mounted upon the upper end of the lever 16.

The levers 17 and 18 are each formed with right-angled extensions 22 which in turn have control handles or pieces 23 thereon.

The levers 17 and 18 at the bend, adjacent the portion 22 engage the block 20.

The block 20 may be of such material as will permit the levers 17 and 18 to frictionally engage therewith so that movement of the lever 16 by engagement of the handle 21 will cause the levers 17 and 18 to move simultaneously therewith.

The lever 16 on the block 20 has a small stop 24 thereon which extends across the slot 19 and limits the movement of the levers 1'7 and 18 relative to the lever 16.

The levers l7 and 18 may be operated independently of each other and independently of the lever 16 by simply engaging the handle 23 and pulling the particular lever away from the block 20 and thereafter slight adjustment of the levers l7 and 18 may be had for adjusting the particular rotor elem? to which the lever is fastened.

One of tl e advantages of my control device is the single means tor operating all of the rotors in unison and yet providing tor independent operation of any of them tor securing fine adjustment.

The use of levers in themselves is quite advantage because it is simple both from a manufacturing standpoint and "from an operating standpoint and enables the use of a cabinet or case for the radio which may be made with a forward or front curved wall.

The use of a casing or cabinet having a front curved wall is itself an {tClVZJliTIgG pecially when radio cabinets are made of metal stampin 's.

In Figures :1 and (l, or the drawings, I have shown a slightly modified form of control in which case the rotor elements 14: are all mounted upon common shaft 25 and operated through a single control lever 26.

The control lever 26 extends through the slot 19 in the casing A or cabinet A.

Two of the stators 18 are capable of slight movement and in order to accomplish this movement- I provide a pair of levers :2? which project away from the stators l3 and extend through short slots 28 formed in the front wall 12 of the cabinet A.

The lever 27 may frictionally engage with the edges of the slots 28 that when the levers are moved they will remain in any moved position.

In this form of control the stators are capable of slight adjustment and the rotors are moved in unison and the stators are capable of independent movement relative to each other.

It will be noted that while I have described my condenser as applicable for radios it may be equally as well used in con- .uection with other electrical devices where condensers and condenser controls are necessary.

Some changes may be made in the construction and arrangement of the various parts of my invention. without departing from the real spirit and purpose ot'any in vention, and it is mv in,ention to cover by my claims, any modified terms of structure or use of mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention 1. A condenser for radios in aiding a casing, a plurality of stator and rotor elements therein, a control device for the rotors comprising a lever for each rotor having its control end extended through a slot in the casing, each lever having its control end 'ed with the others tor permitting EllORilQ of all or the lovers in unison, each of said control ends being capable of being moved to position tree from the others for independent movement of any li.i

to. operating a rotor.

r A condenser tor radios including a cashaving a curved wall formed in an at substantially JO degrees, a plurality or stator and rotor elements therein, a control device tor the rotors comprising a lever for each rotor having its control end eX- tended through a slot in the curved wall oi the casing, each lever having its control end engaged with the others for permitting movement of, all of the levers in unison, each of said control ends being capable of being moved to position tree from the others for permitting independent movement of any lever for operating a rotor.

3. it. condenser tor radios including a cashaving a curved wall formed in an are ubstantially 90 degrees, a plurality of stator and rotor elements therein, acontrol device for the rotors comprising a lever for each rotor having its control end extended through a slot in the curved wall of the casing, each lever having its control end engaged with the others for permitting movement of all of the levers in unison each of said control ends being capable of being moved to position free from the others :tor iermitting independent movement of anv lever tor operating a rotor, all of said levers being capable of movement through an arc o't' substantially 90 degrees.

A multiple condenser for radios consisting ot a series 01"" pairs of stator and rotor elements, each pair of elements comprising a separate individual unit for tuning an independent circuit, a main lever for producing simultaneous adjustment of all units and auxiliary levers in engagement therewith but capable of disengagement iereby independent adjustment of each inidual unit is accomplished.

i condenser for radios comprising a pl irality of stator elements, a plurality of elements, a lever for each rotor eleone of said levers being provided h a friction plate and the other levers lag resilient whereby they are held in trictional engagement with said plate, and simultaneous movement of all the rotors is a complished when said lever having the trictiou plate is moved, said other levers, due to their resiliency being capable of moven'ient away from the friction plate whereby independent movement of their respective rotors is possible.

(i. A multiple condenser tor radios includa casing, a plurality of variable capacity elements therein, a control device compr1sing a main lever extending through the wall of the casing and adapted to vary the capacity of all elements in unison, and an auxiliary lever extending through the casing wall capable of varying the capacity of an individual element.

7. A multiple condenser for radios including a. casing, a plurality of variable capacity elements therein, a control device 10 comprising a main lever for controlling one of said variable capacity elements and extending through the Wall of the casing, an auxiliary lever for each of the remaining variable capacity elements for controlling them, all of said levers being in engagement whereby movement of the main lever Will move the auxiliary levers, said levers being capable of disengagement whereby any auxiliary lever may be independently moved.

WILLIAM G. DUNN. 

